1GA4:
reference: Carboxyl proteinase from Pseudomonas defines a novel family of subtilisin-like enzymes., Wlodawer A, Li M, Dauter Z, Gustchina A, Uchida K, Oyama H, Dunn BM, Oda K, Nat Struct Biol 2001 May;8(5):442-6. PMID: 11323721

This OCA Structure page
uses Jmol, developed by the Jmol Development Team (documentation).